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arm: mach-k3: Workaround errata ID i2331

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Errata doc: https://www.ti.com/lit/pdf/sprz457
Errata ID i2331 CPSW: Device lockup when reading CPSW registers

Details: A device lockup can occur during the second read of any CPSW
subsystem register after any MAIN domain power on reset (POR). A MAIN
domain POR occurs using the hardware MCU_PORz signal, or via software
using CTRLMMR_RST_CTRL.SW_MAIN_POR or CTRLMMR_MCU_RST_CTRL.SW_MAIN_POR.
After these resets, the processor and internal bus structures may get
into a state which is only recoverable with full device reset using
MCU_PORz.
Due to this errata, Ethernet boot should not be used on this device.

Workaround(s): To avoid the lockup, a warm reset should be issued after
a MAIN domain POR and before any access to the CPSW registers. The warm
reset realigns internal clocks and prevents the lockup from happening.
Workaround above errata by calling do_reset() in case of cold boot in
order to trigger warm reset. This needs enabling SYSRESET driver in R5
SPL to enable TI SCI reset driver.

Signed-off-by: Nitin Yadav <n-yadav@ti.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
This commit is contained in:
Nitin Yadav
2023-04-06 13:29:36 +05:30
committed by Tom Rini
parent 7bf341ae4d
commit 4d03f476a7
2 changed files with 36 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
arch/arm/mach-k3/am642_init.c
View File

@@ -20,9 +20,15 @@
#include <dm/pinctrl.h>
#include <mmc.h>
#include <dm/root.h>
#include <command.h>
#define CTRLMMR_MCU_RST_CTRL 0x04518170
#define CTRLMMR_MCU_RST_SRC (MCU_CTRL_MMR0_BASE + 0x18178)
#define COLD_BOOT 0
#define SW_POR_MCU BIT(24)
#define SW_POR_MAIN BIT(25)
static void ctrl_mmr_unlock(void)
{
/* Unlock all PADCFG_MMR1 module registers */
@@ -164,6 +170,7 @@ void board_init_f(ulong dummy)
#if defined(CONFIG_K3_LOAD_SYSFW) || defined(CONFIG_K3_AM64_DDRSS) || defined(CONFIG_ESM_K3)
struct udevice *dev;
int ret;
int rst_src;
#endif
#if defined(CONFIG_CPU_V7R)
@@ -206,6 +213,32 @@ void board_init_f(ulong dummy)
k3_mmc_restart_clock);
#endif
#if defined(CONFIG_CPU_V7R)
/*
* Errata ID i2331 CPSW: A device lockup can occur during the second
* read of any CPSW subsystem register after any MAIN domain power on
* reset (POR). A MAIN domain POR occurs using the hardware MCU_PORz
* signal, or via software using CTRLMMR_RST_CTRL.SW_MAIN_POR or
* CTRLMMR_MCU_RST_CTRL.SW_MAIN_POR. After these resets, the processor
* and internal bus structures may get into a state which is only
* recoverable with full device reset using MCU_PORz.
* Workaround(s): To avoid the lockup, a warm reset should be issued
* after a MAIN domain POR and before any access to the CPSW registers.
* The warm reset realigns internal clocks and prevents the lockup from
* happening.
*/
ret = uclass_first_device_err(UCLASS_SYSRESET, &dev);
if (ret)
printf("\n%s:uclass device error [%d]\n",__func__,ret);
rst_src = readl(CTRLMMR_MCU_RST_SRC);
if (rst_src == COLD_BOOT || rst_src & (SW_POR_MCU | SW_POR_MAIN)) {
printf("Resetting on cold boot to workaround ErrataID:i2331\n");
printf("Please resend tiboot3.bin in case of UART/DFU boot\n");
do_reset(NULL, 0, 0, NULL);
}
#endif
/* Output System Firmware version info */
k3_sysfw_print_ver();

3
configs/am64x_evm_r5_defconfig
View File

@@ -169,3 +169,6 @@ CONFIG_USB_GADGET_VENDOR_NUM=0x0451
CONFIG_USB_GADGET_PRODUCT_NUM=0x6165
CONFIG_USB_GADGET_DOWNLOAD=y
CONFIG_FS_FAT_MAX_CLUSTSIZE=16384
CONFIG_SYSRESET=y
CONFIG_SPL_SYSRESET=y
CONFIG_SYSRESET_TI_SCI=y